A course for US military officers has been teaching that America’s enemy is Islam in general and suggesting that the country might ultimately have to obliterate the Islamic holy cities of Mecca and Medina without regard for civilian deaths, following second world war precedents of the nuclear attack on Hiroshima.

The Pentagon suspended the course in late April when a student objected to the material. The FBI also changed some agent training last year after discovering that it, too, was critical of Islam.